With no other mods to your car, then the potential gain would be about zero.
The stock throttle body is adequate enough with a stock car. Also I have read that machining it out more than 69mm can make the walls too thin and it can break.
I have got a 69mm throttle body and all it really did was mess with the shift points, damn annoying too. Had to get it fixed when I got it tuned.
-Adrian
-Democracy must be something more than two wolves and a sheep voting on what to have for dinner.
James Bovard, Civil Libertarian (1994)
-Giving money and power to government is like giving whiskey and car keys to teenage boys.
P.J. O'Rourke, Civil Libertarian
-Government's view of the economy could be summed up in a few short Phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it.
Ronald Reagan (1986)